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Simulator_LockFreeMultiArrayQueue.html
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1079 lines (1016 loc) · 44.4 KB
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="description" content="Interactive Simulator of the Lock-Free Multi-Array Queue">
<title>Interactive Simulator of the Lock-Free Multi-Array Queue</title>
<style>
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
color: #24292e;
background-color: #fdfdfd;
-webkit-text-size-adjust: 100%;
-webkit-font-feature-settings: "kern" 1;
-moz-font-feature-settings: "kern" 1;
-o-font-feature-settings: "kern" 1;
font-feature-settings: "kern" 1;
font-kerning: normal;
padding-right: 30px;
padding-left: 30px;
}
h1 {
margin-bottom: 10px;
}
h4 {
margin-top: 0px;
margin-bottom: 10px;
}
button {
padding: 10px;
margin-right: 20px;
margin-bottom: 10px;
}
button.process {
padding: 5px;
margin-top: 5px;
margin-right: 5px;
margin-bottom: 5px;
}
td {
vertical-align: top;
}
td.process {
border: 1px solid #000000;
}
td.process_desc {
width: 250px;
max-width: 250px;
height: 140px;
font-size: small;
line-height: 1.5;
white-space: pre;
}
td.process_buttons {
text-align: right;
}
span.assertMessage {
font-weight: bold;
color: red;
}
span.casFailedMessage {
font-weight: bold;
color: black;
}
span.casSucceededMessage {
font-weight: bold;
color: green;
}
span.casRemarkMessage {
font-style: italic;
}
span.linearizationPointMessage {
font-weight: bold;
color: blue;
}
span.nextStep {
color: darkviolet;
}
div.trail {
font-size: small;
line-height: 1.5;
white-space: pre;
}
</style>
</head>
<body>
<h1>Interactive Simulator of the Lock-Free Multi-Array Queue</h1>
<h4 id="subcap"></h4>
<table>
<tr>
<td class="process">
<table>
<tr>
<td class="process_desc" id="process_desc_0">
</td>
<td class="process_buttons">
<button class="process" id="enq_atom_step_0" onclick="enqueue_atomic_step(0)">enq. atom. step</button>
<button class="process" id="enq_full_0" onclick="enqueue_full(0)">enq. full</button>
<br>
<button class="process" id="deq_atom_step_0" onclick="dequeue_atomic_step(0)">deq. atom. step</button>
<button class="process" id="deq_full_0" onclick="dequeue_full(0)">deq. full</button>
<br>
<button class="process" id="thread_die_0" onclick="thread_die(0)">die</button>
</td>
</tr>
</table>
</td>
<td rowspan="4"><canvas id="canv" width="420px" height="600px"></canvas></td>
</tr>
<tr>
<td class="process">
<table>
<tr>
<td class="process_desc" id="process_desc_1">
</td>
<td class="process_buttons">
<button class="process" id="enq_atom_step_1" onclick="enqueue_atomic_step(1)">enq. atom. step</button>
<button class="process" id="enq_full_1" onclick="enqueue_full(1)">enq. full</button>
<br>
<button class="process" id="deq_atom_step_1" onclick="dequeue_atomic_step(1)">deq. atom. step</button>
<button class="process" id="deq_full_1" onclick="dequeue_full(1)">deq. full</button>
<br>
<button class="process" id="thread_die_1" onclick="thread_die(1)">die</button>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td class="process">
<table>
<tr>
<td class="process_desc" id="process_desc_2">
</td>
<td class="process_buttons">
<button class="process" id="enq_atom_step_2" onclick="enqueue_atomic_step(2)">enq. atom. step</button>
<button class="process" id="enq_full_2" onclick="enqueue_full(2)">enq. full</button>
<br>
<button class="process" id="deq_atom_step_2" onclick="dequeue_atomic_step(2)">deq. atom. step</button>
<button class="process" id="deq_full_2" onclick="dequeue_full(2)">deq. full</button>
<br>
<button class="process" id="thread_die_2" onclick="thread_die(2)">die</button>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td class="process">
<table>
<tr>
<td class="process_desc" id="process_desc_3">
</td>
<td class="process_buttons">
<button class="process" id="enq_atom_step_3" onclick="enqueue_atomic_step(3)">enq. atom. step</button>
<button class="process" id="enq_full_3" onclick="enqueue_full(3)">enq. full</button>
<br>
<button class="process" id="deq_atom_step_3" onclick="dequeue_atomic_step(3)">deq. atom. step</button>
<button class="process" id="deq_full_3" onclick="dequeue_full(3)">deq. full</button>
<br>
<button class="process" id="thread_die_3" onclick="thread_die(3)">die</button>
</td>
</tr>
</table>
</td>
</tr>
</table>
<br>
<button id="LFMAQ_1_2" onclick="start_again(1,2)">Start again LFMAQ(1,2)</button>
<button id="LFMAQ_5_1" onclick="start_again(5,1)">LFMAQ(5,1)</button>
<button id="LFMAQ_10_0" onclick="start_again(10,0)">LFMAQ(10,0)</button>
<button id="LFMAQ_1_0" onclick="start_again(1,0)">LFMAQ(1,0) corner case</button>
<button id="random_finish_all" onclick="random_finish_all()"><b>Random finish all</b></button>
<button id="show_trail" onclick="show_trail()">Show trail</button>
<div class="trail" id="trail"></div>
<script>
"use strict"
const subcap = document.getElementById("subcap")
const canv = document.getElementById("canv")
const ctx = canv.getContext("2d")
// ----------------------
var leftOff
const elemSize = 42
const divDist = 12
const bottOff = divDist * 5
const arrDist = divDist * 7 + elemSize
function arrow_up(x, y) {
ctx.lineTo( x, y )
ctx.lineTo( x - 3, y + 5 )
ctx.moveTo( x, y )
ctx.lineTo( x + 3, y + 5 )
}
function arrow_left(x, y ) {
ctx.lineTo( x, y )
ctx.lineTo( x + 5, y - 3 )
ctx.moveTo( x, y )
ctx.lineTo( x + 5, y + 3 )
}
function draw_element(rix, ix) {
// background
if (rings[rix][ix].full) {
ctx.fillStyle = "#FF9999" // full
} else {
ctx.fillStyle = "#FFFFFF" // empty
}
ctx.fillRect( leftOff + (rix * arrDist), canv.height - bottOff - elemSize - (ix * elemSize), elemSize, elemSize )
// border
ctx.lineWidth = 2
ctx.strokeStyle = "#000000"
ctx.strokeRect( leftOff + (rix * arrDist), canv.height - bottOff - elemSize - (ix * elemSize), elemSize, elemSize )
// divertToRix indicator
if (0 != rings[rix][ix].divertToRix) {
ctx.fillStyle = "#000000"
ctx.beginPath()
ctx.moveTo(leftOff + (rix * arrDist) + elemSize, canv.height - bottOff - elemSize - (ix * elemSize) + 9)
ctx.lineTo(leftOff + (rix * arrDist) + elemSize + 10, canv.height - bottOff - elemSize - (ix * elemSize) + 15)
ctx.lineTo(leftOff + (rix * arrDist) + elemSize, canv.height - bottOff - elemSize - (ix * elemSize) + 21)
ctx.closePath()
ctx.fill()
}
// round,value
let txt
if (rings[rix][ix].dirty) {
txt = rings[rix][ix].round + "," + rings[rix][ix].value
} else {
txt = "clean"
}
ctx.font = "14px Arial"
ctx.textAlign = "center"
ctx.fillStyle = "#000000"
ctx.fillText( txt,
leftOff + (rix * arrDist) + (elemSize / 2),
canv.height - bottOff - elemSize - (ix * elemSize) + 16)
// W,R,WR indicator
txt = ""
if ((rix == writerPositionRix) && (ix == writerPositionIx)) txt += "W"
if ((rix == readerPositionRix) && (ix == readerPositionIx)) txt += "R"
if ("" != txt) {
ctx.fillText( txt,
leftOff + (rix * arrDist) + (elemSize / 2),
canv.height - bottOff - elemSize - (ix * elemSize) + elemSize - 6)
}
}
function draw_implicit_return() {
ctx.lineWidth = 1
ctx.strokeStyle = "#000000"
ctx.beginPath()
ctx.moveTo( leftOff + (elemSize / 2) , canv.height - bottOff - (FIRST_ARRAY_SIZE * elemSize) )
ctx.lineTo( leftOff + (elemSize / 2) , canv.height - bottOff - (FIRST_ARRAY_SIZE * elemSize) - divDist )
ctx.lineTo( leftOff - (2 * divDist) , canv.height - bottOff - (FIRST_ARRAY_SIZE * elemSize) - divDist )
ctx.lineTo( leftOff - (2 * divDist) , canv.height - bottOff + divDist )
ctx.lineTo( leftOff + (elemSize / 2) , canv.height - bottOff + divDist )
arrow_up ( leftOff + (elemSize / 2) , canv.height - bottOff + 1 )
ctx.stroke()
}
function draw_diversion(divertToRix, rix, ix) {
if ((0 == rix) && (0 == ix)) {
if (diversion_0_0_drawn) return // the CAS in diversions[] for diversion at (0,0) may succeed multiple times, but draw only once
diversion_0_0_drawn = true
}
ctx.lineWidth = 1
ctx.strokeStyle = "#000000"
ctx.beginPath()
ctx.moveTo( leftOff + (rix * arrDist) + elemSize + 10 , canv.height - bottOff - elemSize - (ix * elemSize) + 15 )
ctx.lineTo( leftOff + (rix * arrDist) + elemSize + ((1 + divertToRix) * divDist) , canv.height - bottOff - elemSize - (ix * elemSize) + 15 )
ctx.lineTo( leftOff + (rix * arrDist) + elemSize + ((1 + divertToRix) * divDist) , canv.height - bottOff + (divertToRix * divDist) )
ctx.lineTo( leftOff + (divertToRix * arrDist) + (elemSize / 2) , canv.height - bottOff + (divertToRix * divDist) )
arrow_up ( leftOff + (divertToRix * arrDist) + (elemSize / 2) , canv.height - bottOff + 1 )
ctx.stroke()
ctx.beginPath()
ctx.moveTo( leftOff + (divertToRix * arrDist) + (elemSize / 2) , canv.height - bottOff - ((FIRST_ARRAY_SIZE << divertToRix) * elemSize) )
ctx.lineTo( leftOff + (divertToRix * arrDist) + (elemSize / 2) , canv.height - bottOff - ((FIRST_ARRAY_SIZE << divertToRix) * elemSize) - divDist )
ctx.lineTo( leftOff + (rix * arrDist) + elemSize + ((1 + divertToRix) * divDist) , canv.height - bottOff - ((FIRST_ARRAY_SIZE << divertToRix) * elemSize) - divDist )
ctx.lineTo( leftOff + (rix * arrDist) + elemSize + ((1 + divertToRix) * divDist) , canv.height - bottOff - elemSize - (ix * elemSize) )
arrow_left( leftOff + (rix * arrDist) + elemSize + 1 , canv.height - bottOff - elemSize - (ix * elemSize) )
ctx.stroke()
}
function draw_positions() {
ctx.clearRect( 20, 20, 270, 50 )
ctx.font = "14px Arial"
ctx.textAlign = "left"
ctx.fillStyle = "#000000"
ctx.fillText( "writerPosition(round,rix,ix) = (" + writerPositionRound + "," + writerPositionRix + "," + writerPositionIx + ")",
30, 40 )
ctx.fillText( "readerPosition(round,rix,ix) = (" + readerPositionRound + "," + readerPositionRix + "," + readerPositionIx + ")",
30, 60 )
}
// ----------------------
// private data of the Queue
var FIRST_ARRAY_SIZE
var CNT_ALLOWED_EXTENSIONS
var MAXIMUM_CAPACITY
var writerPositionRound
var writerPositionRix
var writerPositionIx
var readerPositionRound
var readerPositionRix
var readerPositionIx
var rings
var diversions
var diversion_0_0_drawn
var ps // per-process states
var atomicSteps = {} // the atomic steps, indexed by their goto labels
var cntEnqueued // verification data
var cntDequeued
var assertMessage
var casFailedMessage
var casSucceededMessage
var casRemarkMessage
var linearizationPointMessage
var trail
// enqueue steps
//
// The primary source of explanations and comments on the Lock-Free Multi-Array Queue algorithms
// is the Promela model for Spin.
atomicSteps["enqueue_read_writer"] = function (pid) {
ps[pid].origWriterRound = writerPositionRound
ps[pid].origWriterRix = writerPositionRix
ps[pid].origWriterIx = writerPositionIx
ps[pid].writerRound = ps[pid].origWriterRound
ps[pid].writerRix = ps[pid].origWriterRix
ps[pid].writerIx = ps[pid].origWriterIx
assert(10000, ps[pid].writerIx < (FIRST_ARRAY_SIZE << ps[pid].writerRix))
ps[pid].nextStep = "enqueue_read_reader"
}
atomicSteps["enqueue_read_reader"] = function (pid) {
ps[pid].readerRound = readerPositionRound
ps[pid].readerRix = readerPositionRix
ps[pid].readerIx = readerPositionIx
assert(10100, ps[pid].readerIx < (FIRST_ARRAY_SIZE << ps[pid].readerRix))
assert(10110, ps[pid].writerRound <= (1 + ps[pid].readerRound))
if ((ps[pid].writerRound == (1 + ps[pid].readerRound))
&& (ps[pid].writerRix == ps[pid].readerRix)
&& (ps[pid].writerIx == ps[pid].readerIx))
{
assert(10120, (1 + rings[ps[pid].writerRix][ps[pid].writerIx].round) == ps[pid].writerRound)
assert(10130, "undefined" !== typeof rings[CNT_ALLOWED_EXTENSIONS])
linearizationPointMessage = "Linearization Point for Queue full"
assert(10140, MAXIMUM_CAPACITY == (cntEnqueued - cntDequeued))
ps[pid].nextStep = "enqueue_done"
} else {
ps[pid].nextStep = "enqueue_read_element"
}
}
atomicSteps["enqueue_read_element"] = function (pid) {
assert(10200, ("undefined" !== typeof rings[ps[pid].writerRix]) && (ps[pid].writerIx < rings[ps[pid].writerRix].length))
ps[pid].elementValue = rings[ps[pid].writerRix][ps[pid].writerIx].value
ps[pid].elementRound = rings[ps[pid].writerRix][ps[pid].writerIx].round
ps[pid].elementDirty = rings[ps[pid].writerRix][ps[pid].writerIx].dirty
ps[pid].elementDivertToRix = rings[ps[pid].writerRix][ps[pid].writerIx].divertToRix
assert(10210, (ps[pid].writerRound <= (1 + ps[pid].elementRound)) || (false == ps[pid].elementDirty))
ps[pid].divertToRixNew = 0
ps[pid].linearized = false
ps[pid].elementCasAssert = true
if ((ps[pid].writerRound != (1 + ps[pid].elementRound)) && ps[pid].elementDirty) {
ps[pid].nextStep = "enqueue_extension_help"
} else {
if (ps[pid].writerRound == (1 + ps[pid].readerRound)) {
if ((ps[pid].writerRix == ps[pid].readerRix) && (ps[pid].writerIx == ps[pid].readerIx)) {
assert(10220, false)
}
} else {
assert(10230, ps[pid].writerRound == ps[pid].readerRound)
}
ps[pid].nextStep = "enqueue_check_if_new_diversion"
}
}
atomicSteps["enqueue_check_if_new_diversion"] = function (pid) {
if (0 == ps[pid].elementDivertToRix) {
let testNextWriterRix = ps[pid].writerRix
let testNextWriterIx = (1 + ps[pid].writerIx)
for (;;) {
if ((FIRST_ARRAY_SIZE << testNextWriterRix) == testNextWriterIx) {
if (0 == testNextWriterRix) {
testNextWriterRix = 0
testNextWriterIx = 0
break
} else {
let tmpRix = testNextWriterRix
testNextWriterRix = diversions[tmpRix - 1].rix
testNextWriterIx = (1 + diversions[tmpRix - 1].ix)
}
} else break
}
for (;;) {
assert(10300, (FIRST_ARRAY_SIZE << testNextWriterRix) != testNextWriterIx)
if ((ps[pid].readerRix == testNextWriterRix) && (ps[pid].readerIx == testNextWriterIx)) {
ps[pid].nextStep = "enqueue_check_if_new_diversion_yes"
break
} else if (0 == rings[testNextWriterRix][testNextWriterIx].divertToRix) {
ps[pid].nextStep = "enqueue_element_cas"
break
} else {
testNextWriterRix = rings[testNextWriterRix][testNextWriterIx].divertToRix
testNextWriterIx = 0
if ("undefined" === typeof rings[testNextWriterRix]) {
ps[pid].elementCasAssert = false
ps[pid].nextStep = "enqueue_element_cas"
break
}
}
}
} else {
ps[pid].nextStep = "enqueue_element_cas"
}
}
atomicSteps["enqueue_check_if_new_diversion_yes"] = function (pid) {
assert(10400, 0 == ps[pid].divertToRixNew)
for (;;) {
if ("undefined" === typeof rings[ps[pid].divertToRixNew]) {
break
} else if (ps[pid].divertToRixNew == CNT_ALLOWED_EXTENSIONS) {
ps[pid].divertToRixNew = 0
break
} else {
ps[pid].divertToRixNew ++
}
}
ps[pid].nextStep = "enqueue_element_cas"
}
atomicSteps["enqueue_element_cas"] = function (pid) {
assert(10500, (ps[pid].writerRound == (1 + ps[pid].elementRound)) || (false == ps[pid].elementDirty))
assert(10510, ((0 == ps[pid].divertToRixNew) || (0 == ps[pid].elementDivertToRix)))
if ((ps[pid].elementValue == rings[ps[pid].writerRix][ps[pid].writerIx].value)
&& (ps[pid].elementRound == rings[ps[pid].writerRix][ps[pid].writerIx].round)
&& (ps[pid].elementDirty == rings[ps[pid].writerRix][ps[pid].writerIx].dirty)
&& (ps[pid].elementDivertToRix == rings[ps[pid].writerRix][ps[pid].writerIx].divertToRix))
{
assert(10520, ps[pid].elementCasAssert)
casSucceededMessage = "element CAS succeeded"
linearizationPointMessage = "Linearization Point of enqueue"
ps[pid].linearized = true
cntEnqueued ++
rings[ps[pid].writerRix][ps[pid].writerIx].value = cntEnqueued
rings[ps[pid].writerRix][ps[pid].writerIx].round = ps[pid].writerRound
rings[ps[pid].writerRix][ps[pid].writerIx].dirty = true
rings[ps[pid].writerRix][ps[pid].writerIx].divertToRix = (ps[pid].divertToRixNew | ps[pid].elementDivertToRix)
//---
rings[ps[pid].writerRix][ps[pid].writerIx].full = true
draw_element(ps[pid].writerRix,ps[pid].writerIx)
//---
ps[pid].elementValue = cntEnqueued
ps[pid].elementRound = ps[pid].writerRound
ps[pid].elementDirty = true
ps[pid].elementDivertToRix = (ps[pid].divertToRixNew | ps[pid].elementDivertToRix)
} else {
casFailedMessage = "element CAS failed"
ps[pid].elementValue = rings[ps[pid].writerRix][ps[pid].writerIx].value
ps[pid].elementRound = rings[ps[pid].writerRix][ps[pid].writerIx].round
ps[pid].elementDirty = rings[ps[pid].writerRix][ps[pid].writerIx].dirty
ps[pid].elementDivertToRix = rings[ps[pid].writerRix][ps[pid].writerIx].divertToRix
assert(10530, ps[pid].writerRound <= ps[pid].elementRound)
assert(10540, true == ps[pid].elementDirty)
}
ps[pid].nextStep = "enqueue_extension_help"
}
atomicSteps["enqueue_extension_help"] = function (pid) {
if ((0 == ps[pid].elementDivertToRix) || ("undefined" !== typeof rings[ps[pid].elementDivertToRix])) {
ps[pid].nextStep = "enqueue_writer_position_cas"
} else {
ps[pid].nextStep = "enqueue_extension_help_part_1"
}
}
atomicSteps["enqueue_extension_help_part_1"] = function (pid) {
if ((0 == diversions[ps[pid].elementDivertToRix - 1].rix)
&& (0 == diversions[ps[pid].elementDivertToRix - 1].ix))
{
casSucceededMessage = "diversions[" + ps[pid].elementDivertToRix + " - 1] CAS succeeded"
if ((0 == ps[pid].writerRix) && (0 == ps[pid].writerIx) && diversion_0_0_drawn) {
casRemarkMessage = "(may succeed multiple times for diversion at (0,0))"
}
for (let tmpRix = 1; tmpRix <= CNT_ALLOWED_EXTENSIONS; tmpRix ++) {
assert(10700, (diversions[tmpRix - 1].rix != ps[pid].writerRix)
|| (diversions[tmpRix - 1].ix != ps[pid].writerIx)
|| ((0 == ps[pid].writerRix) && (0 == ps[pid].writerIx)))
}
diversions[ps[pid].elementDivertToRix - 1].rix = ps[pid].writerRix
diversions[ps[pid].elementDivertToRix - 1].ix = ps[pid].writerIx
//---
draw_diversion(ps[pid].elementDivertToRix, ps[pid].writerRix, ps[pid].writerIx)
//---
} else {
casFailedMessage = "diversions[" + ps[pid].elementDivertToRix + " - 1] CAS failed"
assert(10710, (diversions[ps[pid].elementDivertToRix - 1].rix == ps[pid].writerRix)
&& (diversions[ps[pid].elementDivertToRix - 1].ix == ps[pid].writerIx))
}
ps[pid].nextStep = "enqueue_extension_help_part_2"
}
atomicSteps["enqueue_extension_help_part_2"] = function (pid) {
if ("undefined" === typeof rings[ps[pid].elementDivertToRix]) {
casSucceededMessage = "rings[" + ps[pid].elementDivertToRix + "] CAS succeeded"
for (let tmpRix = 0; tmpRix <= CNT_ALLOWED_EXTENSIONS; tmpRix ++) {
assert(10800, ("undefined" === typeof rings[tmpRix])
|| (rings[tmpRix].length != (FIRST_ARRAY_SIZE << ps[pid].elementDivertToRix)))
}
set_ring(ps[pid].elementDivertToRix)
} else {
casFailedMessage = "rings[" + ps[pid].elementDivertToRix + "] CAS failed"
assert(10810, rings[ps[pid].elementDivertToRix].length == (FIRST_ARRAY_SIZE << ps[pid].elementDivertToRix))
}
ps[pid].nextStep = "enqueue_writer_position_cas"
}
atomicSteps["enqueue_writer_position_cas"] = function (pid) {
if (0 != ps[pid].elementDivertToRix) {
ps[pid].writerRix = ps[pid].elementDivertToRix
ps[pid].writerIx = 0
} else {
ps[pid].writerIx ++
for (; ((FIRST_ARRAY_SIZE << ps[pid].writerRix) == ps[pid].writerIx) ;) {
if (0 == ps[pid].writerRix) {
ps[pid].writerRound ++
ps[pid].writerRix = 0
ps[pid].writerIx = 0
break
} else {
let tmpRix = ps[pid].writerRix
ps[pid].writerRix = diversions[tmpRix - 1].rix
ps[pid].writerIx = (1 + diversions[tmpRix - 1].ix)
}
}
}
if (((1 + readerPositionRound) == ps[pid].writerRound)
&& (readerPositionRix == ps[pid].writerRix)
&& (readerPositionIx == ps[pid].writerIx)
&& ("undefined" === typeof rings[CNT_ALLOWED_EXTENSIONS]))
{
assert(10900, false)
}
assert(10910, ps[pid].writerIx < (FIRST_ARRAY_SIZE << ps[pid].writerRix))
if ((ps[pid].origWriterRound == writerPositionRound)
&& (ps[pid].origWriterRix == writerPositionRix)
&& (ps[pid].origWriterIx == writerPositionIx))
{
casSucceededMessage = "Writer position CAS succeeded"
writerPositionRound = ps[pid].writerRound
writerPositionRix = ps[pid].writerRix
writerPositionIx = ps[pid].writerIx
assert(10920, ps[pid].elementDivertToRix == rings[ps[pid].origWriterRix][ps[pid].origWriterIx].divertToRix)
//---
draw_element(ps[pid].origWriterRix,ps[pid].origWriterIx)
draw_element(ps[pid].writerRix,ps[pid].writerIx)
draw_positions()
//---
} else {
casFailedMessage = "Writer position CAS failed"
ps[pid].writerRound = writerPositionRound
ps[pid].writerRix = writerPositionRix
ps[pid].writerIx = writerPositionIx
}
ps[pid].origWriterRound = ps[pid].writerRound
ps[pid].origWriterRix = ps[pid].writerRix
ps[pid].origWriterIx = ps[pid].writerIx
if (ps[pid].linearized) {
ps[pid].nextStep = "enqueue_done"
} else {
assert(10930, ps[pid].readerRound <= (1 + ps[pid].writerRound))
if ((ps[pid].writerRound == ps[pid].readerRound)
&& ((0 != ps[pid].readerIx) || ((FIRST_ARRAY_SIZE << ps[pid].writerRix) != (1 + ps[pid].writerIx)))) {
ps[pid].nextStep = "enqueue_read_element"
} else if ((ps[pid].writerRound == (1 + ps[pid].readerRound))
&& (ps[pid].writerRix == ps[pid].readerRix)
&& ((1 + ps[pid].writerIx) < ps[pid].readerIx))
{
ps[pid].nextStep = "enqueue_read_element"
} else {
ps[pid].nextStep = "enqueue_read_reader"
}
}
}
// dequeue steps
atomicSteps["dequeue_read_reader"] = function (pid) {
ps[pid].origReaderRound = readerPositionRound
ps[pid].origReaderRix = readerPositionRix
ps[pid].origReaderIx = readerPositionIx
ps[pid].readerRound = ps[pid].origReaderRound
ps[pid].readerRix = ps[pid].origReaderRix
ps[pid].readerIx = ps[pid].origReaderIx
assert(20000, ps[pid].readerIx < (FIRST_ARRAY_SIZE << ps[pid].readerRix))
ps[pid].nextStep = "dequeue_read_element"
}
atomicSteps["dequeue_read_element"] = function (pid) {
assert(20200, ("undefined" !== typeof rings[ps[pid].readerRix]) && (ps[pid].readerIx < rings[ps[pid].readerRix].length))
ps[pid].elementValue = rings[ps[pid].readerRix][ps[pid].readerIx].value
ps[pid].elementRound = rings[ps[pid].readerRix][ps[pid].readerIx].round
ps[pid].elementDirty = rings[ps[pid].readerRix][ps[pid].readerIx].dirty
ps[pid].elementDivertToRix = rings[ps[pid].readerRix][ps[pid].readerIx].divertToRix
assert(20210, (ps[pid].readerRound <= (1 + ps[pid].elementRound)) || (false == ps[pid].elementDirty))
if ((ps[pid].readerRound == (1 + ps[pid].elementRound)) || (false == ps[pid].elementDirty)) {
linearizationPointMessage = "Linearization point for Queue empty"
assert(20220, cntEnqueued == cntDequeued)
ps[pid].nextStep = "dequeue_done"
} else {
ps[pid].nextStep = "dequeue_extension_help"
}
}
atomicSteps["dequeue_extension_help"] = function (pid) {
if ((0 == ps[pid].elementDivertToRix) || ("undefined" !== typeof rings[ps[pid].elementDivertToRix])) {
ps[pid].nextStep = "dequeue_reader_position_cas"
} else {
ps[pid].nextStep = "dequeue_extension_help_part_1"
}
}
atomicSteps["dequeue_extension_help_part_1"] = function (pid) {
if ((0 == diversions[ps[pid].elementDivertToRix - 1].rix)
&& (0 == diversions[ps[pid].elementDivertToRix - 1].ix))
{
casSucceededMessage = "diversions[" + ps[pid].elementDivertToRix + " - 1] CAS succeeded"
if ((0 == ps[pid].readerRix) && (0 == ps[pid].readerIx) && diversion_0_0_drawn) {
casRemarkMessage = "(may succeed multiple times for diversion at (0,0))"
}
for (let tmpRix = 1; tmpRix <= CNT_ALLOWED_EXTENSIONS; tmpRix ++) {
assert(20700, (diversions[tmpRix - 1].rix != ps[pid].readerRix)
|| (diversions[tmpRix - 1].ix != ps[pid].readerIx)
|| ((0 == ps[pid].readerRix) && (0 == ps[pid].readerIx)))
}
diversions[ps[pid].elementDivertToRix - 1].rix = ps[pid].readerRix
diversions[ps[pid].elementDivertToRix - 1].ix = ps[pid].readerIx
//---
draw_diversion(ps[pid].elementDivertToRix, ps[pid].readerRix, ps[pid].readerIx)
//---
} else {
casFailedMessage = "diversions[" + ps[pid].elementDivertToRix + " - 1] CAS failed"
assert(20710, (diversions[ps[pid].elementDivertToRix - 1].rix == ps[pid].readerRix)
&& (diversions[ps[pid].elementDivertToRix - 1].ix == ps[pid].readerIx))
}
ps[pid].nextStep = "dequeue_extension_help_part_2"
}
atomicSteps["dequeue_extension_help_part_2"] = function (pid) {
if ("undefined" === typeof rings[ps[pid].elementDivertToRix]) {
casSucceededMessage = "rings[" + ps[pid].elementDivertToRix + "] CAS succeeded"
for (let tmpRix = 0; tmpRix <= CNT_ALLOWED_EXTENSIONS; tmpRix ++) {
assert(20800, ("undefined" === typeof rings[tmpRix])
|| (rings[tmpRix].length != (FIRST_ARRAY_SIZE << ps[pid].elementDivertToRix)))
}
set_ring(ps[pid].elementDivertToRix)
} else {
casFailedMessage = "rings[" + ps[pid].elementDivertToRix + "] CAS failed"
assert(20810, rings[ps[pid].elementDivertToRix].length == (FIRST_ARRAY_SIZE << ps[pid].elementDivertToRix))
}
ps[pid].nextStep = "dequeue_reader_position_cas"
}
atomicSteps["dequeue_reader_position_cas"] = function (pid) {
if (0 != ps[pid].elementDivertToRix) {
ps[pid].readerRix = ps[pid].elementDivertToRix
ps[pid].readerIx = 0
} else {
ps[pid].readerIx ++
for (; ((FIRST_ARRAY_SIZE << ps[pid].readerRix) == ps[pid].readerIx) ;) {
if (0 == ps[pid].readerRix) {
ps[pid].readerRound ++
ps[pid].readerRix = 0
ps[pid].readerIx = 0
break
} else {
let tmpRix = ps[pid].readerRix
ps[pid].readerRix = diversions[tmpRix - 1].rix
ps[pid].readerIx = (1 + diversions[tmpRix - 1].ix)
}
}
}
assert(20900, ps[pid].readerIx < (FIRST_ARRAY_SIZE << ps[pid].readerRix))
if ((ps[pid].origReaderRound == readerPositionRound)
&& (ps[pid].origReaderRix == readerPositionRix)
&& (ps[pid].origReaderIx == readerPositionIx))
{
casSucceededMessage = "Reader position CAS succeeded"
readerPositionRound = ps[pid].readerRound
readerPositionRix = ps[pid].readerRix
readerPositionIx = ps[pid].readerIx
assert(20910, ps[pid].elementDivertToRix == rings[ps[pid].origReaderRix][ps[pid].origReaderIx].divertToRix)
//---
rings[ps[pid].origReaderRix][ps[pid].origReaderIx].full = false
draw_element(ps[pid].origReaderRix,ps[pid].origReaderIx)
draw_element(ps[pid].readerRix,ps[pid].readerIx)
draw_positions()
//---
linearizationPointMessage = "Linearization point of the dequeue"
cntDequeued ++
assert(20920, cntDequeued == ps[pid].elementValue)
ps[pid].nextStep = "dequeue_done"
} else {
casFailedMessage = "Reader position CAS failed"
ps[pid].readerRound = readerPositionRound
ps[pid].readerRix = readerPositionRix
ps[pid].readerIx = readerPositionIx
ps[pid].origReaderRound = ps[pid].readerRound
ps[pid].origReaderRix = ps[pid].readerRix
ps[pid].origReaderIx = ps[pid].readerIx
ps[pid].nextStep = "dequeue_read_element"
}
}
// ----------------------
function assert(assertionID, condition) {
if (false == condition) {
assertMessage += "*** Assertion " + assertionID + " failed ***"
}
}
function set_ring(rix) {
rings[rix] = []
for (let tmpIx = 0; tmpIx < (FIRST_ARRAY_SIZE << rix); tmpIx ++)
{
rings[rix][tmpIx] = {}
rings[rix][tmpIx].value = 0
rings[rix][tmpIx].round = 0
rings[rix][tmpIx].dirty = false
rings[rix][tmpIx].divertToRix = 0
//---
rings[rix][tmpIx].full = false
draw_element(rix, tmpIx, true, true, true)
//---
}
if (0 == rix) {
draw_implicit_return()
}
}
function show_process_state(pid, lastStep) {
let html = ""
if ("" != lastStep) {
html += "last: " + lastStep + "<br>"
}
if (ps[pid].hasOwnProperty("origWriterRound")) {
html += "origWriter = (" + ps[pid].origWriterRound + "," + ps[pid].origWriterRix + ","
+ ps[pid].origWriterIx + ") writer = ("
+ ps[pid].writerRound + "," + ps[pid].writerRix + ","
+ ps[pid].writerIx + ")<br>"
}
if (ps[pid].hasOwnProperty("origReaderRound")) {
html += "origReader = (" + ps[pid].origReaderRound + "," + ps[pid].origReaderRix + ","
+ ps[pid].origReaderIx + ") reader = ("
+ ps[pid].readerRound + "," + ps[pid].readerRix + ","
+ ps[pid].readerIx + ")<br>"
} else if (ps[pid].hasOwnProperty("readerRound")) {
html += "reader = (" + ps[pid].readerRound + "," + ps[pid].readerRix + ","
+ ps[pid].readerIx + ")<br>"
}
if (ps[pid].hasOwnProperty("elementDivertToRix")) {
html += "element = (" + ps[pid].elementDivertToRix + "," + ps[pid].elementDirty + ","
+ ps[pid].elementRound + "," + ps[pid].elementValue + ")<br>"
}
if (ps[pid].hasOwnProperty("divertToRixNew")) {
html += "divertToRixNew = " + ps[pid].divertToRixNew
+ " linearized = " + ps[pid].linearized + "<br>"
}
if ("" != assertMessage) {
html += "<span class=\"assertMessage\">" + assertMessage + "</span><br>"
}
if ("" != casFailedMessage) {
html += "<span class=\"casFailedMessage\">" + casFailedMessage + "</span><br>"
}
if (("" != casSucceededMessage) && ("" != linearizationPointMessage)
&& ("enqueue" == lastStep.substring(0, 7))) { // condense to one line to save space
html += "<span class=\"casSucceededMessage\">" + casSucceededMessage + "</span> "
html += "<span class=\"linearizationPointMessage\">" + linearizationPointMessage + "</span><br>"
if ("" != casRemarkMessage) {
html += "<span class=\"casRemarkMessage\">" + casRemarkMessage + "</span><br>"
}
} else {
if ("" != casSucceededMessage) {
html += "<span class=\"casSucceededMessage\">" + casSucceededMessage + "</span><br>"
}
if ("" != casRemarkMessage) {
html += "<span class=\"casRemarkMessage\">" + casRemarkMessage + "</span><br>"
}
if ("" != linearizationPointMessage) {
html += "<span class=\"linearizationPointMessage\">" + linearizationPointMessage + "</span><br>"
}
}
if (ps[pid].hasOwnProperty("nextStep")) {
html += "next: <span class=\"nextStep\">" + ps[pid].nextStep + "</span>"
}
document.getElementById("process_desc_" + pid).innerHTML = html
}
function atomic_step(pid) {
casFailedMessage = ""
casSucceededMessage = ""
casRemarkMessage = ""
linearizationPointMessage = ""
let stepToExecute = ps[pid].nextStep
if ("enqueue_done" == stepToExecute) {
ps[pid] = {}
} else if ("dequeue_done" == stepToExecute) {
ps[pid] = {}
} else {
atomicSteps[stepToExecute](pid)
trail += "atomicSteps[\"" + stepToExecute + "\"](" + pid + ") // "
trail += "writerPosition = (" + writerPositionRound + "," + writerPositionRix + "," + writerPositionIx + ") "
trail += "readerPosition = (" + readerPositionRound + "," + readerPositionRix + "," + readerPositionIx + ") "
if (ps[pid].hasOwnProperty("origWriterRound")) {
trail += "origWriter = (" + ps[pid].origWriterRound + "," + ps[pid].origWriterRix + ","
+ ps[pid].origWriterIx + ") writer = ("
+ ps[pid].writerRound + "," + ps[pid].writerRix + ","
+ ps[pid].writerIx + ") "
}
if (ps[pid].hasOwnProperty("origReaderRound")) {
trail += "origReader = (" + ps[pid].origReaderRound + "," + ps[pid].origReaderRix + ","
+ ps[pid].origReaderIx + ") reader = ("
+ ps[pid].readerRound + "," + ps[pid].readerRix + ","
+ ps[pid].readerIx + ") "
} else if (ps[pid].hasOwnProperty("readerRound")) {
trail += "reader = (" + ps[pid].readerRound + "," + ps[pid].readerRix + ","
+ ps[pid].readerIx + ") "
}
if (ps[pid].hasOwnProperty("elementDivertToRix")) {
trail += "element = (" + ps[pid].elementDivertToRix + "," + ps[pid].elementDirty + ","
+ ps[pid].elementRound + "," + ps[pid].elementValue + ") "
}
if (ps[pid].hasOwnProperty("divertToRixNew")) {
trail += "divertToRixNew = " + ps[pid].divertToRixNew
+ " linearized = " + ps[pid].linearized + " "
}
if ("" != assertMessage) {
trail += "<span class=\"assertMessage\">" + assertMessage + "</span> "
}
if ("" != casFailedMessage) {
trail += "<span class=\"casFailedMessage\">" + casFailedMessage + "</span> "
}
if ("" != casSucceededMessage) {
trail += "<span class=\"casSucceededMessage\">" + casSucceededMessage + "</span> "
}
if ("" != casRemarkMessage) {
trail += "<span class=\"casRemarkMessage\">" + casRemarkMessage + "</span> "
}
if ("" != linearizationPointMessage) {
trail += "<span class=\"linearizationPointMessage\">" + linearizationPointMessage + "</span> "
}
trail += "next: <span class=\"nextStep\">" + ps[pid].nextStep + "</span><br>"
}
show_process_state(pid, stepToExecute)
}
function enqueue_atomic_step(pid) {
document.getElementById("trail").innerHTML = ""
if ("undefined" === typeof ps[pid].nextStep) {
document.getElementById("deq_atom_step_" + pid).disabled = true
document.getElementById("deq_full_" + pid).disabled = true
ps[pid].nextStep = "enqueue_read_writer"
show_process_state(pid, "")
} else {
atomic_step(pid)
if ("undefined" === typeof ps[pid].nextStep) {
document.getElementById("deq_atom_step_" + pid).disabled = false
document.getElementById("deq_full_" + pid).disabled = false
}
}
}
function enqueue_full(pid) {
document.getElementById("trail").innerHTML = ""
document.getElementById("enq_atom_step_" + pid).disabled = true
document.getElementById("enq_full_" + pid).disabled = true
document.getElementById("thread_die_" + pid).disabled = true
disable_buttons(true)
enqueue_full_next_step(pid)
}
function enqueue_full_next_step(pid) {
enqueue_atomic_step(pid)
if ("undefined" !== typeof ps[pid].nextStep) {
setTimeout(enqueue_full_next_step, 200, pid)
} else {
document.getElementById("enq_atom_step_" + pid).disabled = false
document.getElementById("enq_full_" + pid).disabled = false
document.getElementById("thread_die_" + pid).disabled = false
disable_buttons(false)
}
}
function dequeue_atomic_step(pid) {
document.getElementById("trail").innerHTML = ""
if ("undefined" === typeof ps[pid].nextStep) {
document.getElementById("enq_atom_step_" + pid).disabled = true
document.getElementById("enq_full_" + pid).disabled = true
ps[pid].nextStep = "dequeue_read_reader"
show_process_state(pid, "")
} else {
atomic_step(pid)
if ("undefined" === typeof ps[pid].nextStep) {
document.getElementById("enq_atom_step_" + pid).disabled = false
document.getElementById("enq_full_" + pid).disabled = false
}
}
}
function dequeue_full(pid) {
document.getElementById("trail").innerHTML = ""
document.getElementById("deq_atom_step_" + pid).disabled = true
document.getElementById("deq_full_" + pid).disabled = true
document.getElementById("thread_die_" + pid).disabled = true
disable_buttons(true)
dequeue_full_next_step(pid)
}
function dequeue_full_next_step(pid) {
dequeue_atomic_step(pid)
if ("undefined" !== typeof ps[pid].nextStep) {
setTimeout(dequeue_full_next_step, 200, pid)
} else {
document.getElementById("deq_atom_step_" + pid).disabled = false
document.getElementById("deq_full_" + pid).disabled = false
document.getElementById("thread_die_" + pid).disabled = false
disable_buttons(false)
}
}
function thread_die(pid) {
document.getElementById("trail").innerHTML = ""
ps[pid] = {}
casFailedMessage = ""
casSucceededMessage = ""
casRemarkMessage = ""
linearizationPointMessage = ""
show_process_state(pid, "thread died")
document.getElementById("enq_atom_step_" + pid).disabled = false
document.getElementById("enq_full_" + pid).disabled = false
document.getElementById("deq_atom_step_" + pid).disabled = false
document.getElementById("deq_full_" + pid).disabled = false
}
function random_finish_all() {
document.getElementById("trail").innerHTML = ""
disable_proc_buttons(true)
disable_buttons(true)
random_finish_all_next_step()
}
function random_finish_all_next_step() {
let pid = Math.floor(4 * Math.random()) % 4
let tmpPid = pid
for (;;) {
if ("undefined" !== typeof ps[tmpPid].nextStep) {
atomic_step(tmpPid)
setTimeout(random_finish_all_next_step, 200)
return
} else {
tmpPid = (1 + tmpPid) % 4
if (pid == tmpPid) {
disable_proc_buttons(false)
disable_buttons(false)
return
}
}
}
}
function show_trail() {
document.getElementById("trail").innerHTML = trail
}
function disable_proc_buttons(disabled) {
for (let i = 0; i <= 3; i ++) {
document.getElementById("enq_atom_step_" + i).disabled = disabled
document.getElementById("enq_full_" + i).disabled = disabled
document.getElementById("deq_atom_step_" + i).disabled = disabled
document.getElementById("deq_full_" + i).disabled = disabled
document.getElementById("thread_die_" + i).disabled = disabled
}
}
function disable_buttons(disabled) {
document.getElementById("LFMAQ_1_2").disabled = disabled